Just sand down that terminal first...see if that fixes it...that's free. As for plugs...platinums are crap when modded.

You need a colder plug to run a smaller pulley...3.4" needs headers, a tune, autolite COPPER core 104's, and a 180* T-Stat...hell...even a stock car loves headers.

Just sayin...I bet your plugs were bent or destroyed.